Change batch display behavior to onchange.

Click event acts wierd on mobile.

yeast/templates/yeast/home.html

@@ -115,7 +115,7 @@ input, label {
     });
 
   document.getElementById('batch-select').addEventListener(
-    'click',
+    'change',
     function(e){
       var batch_id = e.target.value;
       for(var i = 0; i < elements.length; i++) {